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    <h1>
      <a href="../../index.html">all files</a> / <a href="index.html">src/util/</a> momentum.js
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        <span class="strong">93.33% </span>
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        <span class="strong">68.75% </span>
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        <span class="strong">100% </span>
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        <span class="strong">93.33% </span>
        <span class="quiet">Lines</span>
        <span class='fraction'>14/15</span>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">export function momentum(current, start, time, lowerMargin, upperMargin, wrapperSize, options, scroll) {
  let distance = current - start
  let speed = Math.abs(distance) / time
&nbsp;
  let {deceleration, itemHeight, swipeBounceTime, wheel, swipeTime} = options
  let duration = swipeTime
  let rate = wheel ? <span class="branch-0 cbranch-no" title="branch not covered" >4 </span>: 15
&nbsp;
  let destination = current + speed / deceleration * (distance &lt; 0 ? -1 : 1)
&nbsp;
  <span class="missing-if-branch" title="if path not taken" >I</span>if (wheel &amp;&amp; <span class="branch-1 cbranch-no" title="branch not covered" >itemHeight)</span> {
<span class="cstat-no" title="statement not covered" >    destination = scroll._findNearestValidWheel(destination).y</span>
  }
&nbsp;
  if (destination &lt; lowerMargin) {
    destination = wrapperSize ? Math.max(lowerMargin - wrapperSize / 4, lowerMargin - (wrapperSize / rate * speed)) : <span class="branch-1 cbranch-no" title="branch not covered" >lowerMargin</span>
    duration = swipeBounceTime
  } else if (destination &gt; upperMargin) {
    destination = wrapperSize ? Math.min(upperMargin + wrapperSize / 4, upperMargin + wrapperSize / rate * speed) : <span class="branch-1 cbranch-no" title="branch not covered" >upperMargin</span>
    duration = swipeBounceTime
  }
&nbsp;
  return {
    destination: Math.round(destination),
    duration
  }
}
&nbsp;</pre></td></tr>
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